Native starch is mainly used in the form of thermoplastic starch in blends with PLA. Although these materials are suitable for film applications, they have generally a very low strength and stiffness. Blends of PLA and granular starch show significantly higher characteristic values. However, this requires pre-drying of the starch prior to the the compounding process. By modifying the granular starch with suitable Additives it is possible to significantly improve the property profile again. Amongst others, Epichlorohydrin has been used to crosslink native starches. One disadvantage is its toxicity. Due to this handicap, starch-blends modified with Epichlorohydrin are limited in their areas of application. Another option as reagent is nonhazardous Glycidylether. Up to now, several process steps are required to dry, modify and blend native starch with PLA. Due to time and cost expenditures it is necessary to improve the compounding process (fewer steps). For process-integrated drying and crosslinking of native starch and subsequent blending with PLA, an inline process was therefore developed that enables energy-efficient processing of starch blends. Native potato Starches with different initial particle sizes were used for processing. Furthermore, the starch was modified using various parameters (crosslinking-agent amount, etc.). To determine the influence of the particle geometry and the process parameters on the properties of the blends, the materials were then examined regarding their mechanical and structural properties. Compared to starch blends with moist or even pre-dried starch, the blends with modified starch exhibited higher mechanical properties. The particle geometry of the native or modified starch has a significant influence on the blend properties. The sphericity of the starch granules in particular is decisive for the highest possible mechanical properties of the blends with PLA.